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Myobloc Side Effects

Generic Name: botulinum toxin type b

Note: This page contains information about the side effects of botulinum toxin type b. Some of the dosage forms included on this document may not apply to the brand name Myobloc.

Not all side effects for Myobloc may be reported. You should always consult a doctor or healthcare professional for medical advice. Side effects can be reported to the FDA here.

For the Consumer

Applies to botulinum toxin type b: intramuscular solution

In addition to its needed effects, some unwanted effects may be caused by botulinum toxin type b (the active ingredient contained in Myobloc). In the event that any of these side effects do occur, they may require medical attention.

If any of the following side effects occur while taking botulinum toxin type b, check with your doctor or nurse immediately:

More common
  • Difficulty with swallowing
  • infection
  • neck pain
  • uncontrolled twisting movements of the neck
Rare
  • Difficulty with breathing or speaking
  • muscle weakness

Some of the side effects that can occur with botulinum toxin type b may not need medical attention. As your body adjusts to the medicine during treatment these side effects may go away. Your health care professional may also be able to tell you about ways to reduce or prevent some of these side effects. If any of the following side effects continue, are bothersome or if you have any questions about them, check with your health care professional:

More common
  • Acid or sour stomach
  • back pain
  • belching
  • bleeding, blistering, burning, coldness, discoloration of the skin, feeling of pressure, hives, infection, inflammation, itching, lumps, numbness, pain, rash, redness, scarring, soreness, stinging, swelling, tenderness, tingling, ulceration, or warmth at the injection site
  • cough
  • difficulty with moving
  • dizziness
  • dry mouth
  • flu-like syndrome
  • headache
  • heartburn or indigestion
  • lack or loss of strength or energy
  • muscle pain, stiffness, or weakness
  • nausea
  • pain, swelling, or redness in the joints
  • stomach discomfort, upset, or pain

Some of the side effects that can occur with botulinum toxin type b may not need medical attention. As your body adjusts to the medicine during treatment these side effects may go away. Your health care professional may also be able to tell you about ways to reduce or prevent some of these side effects. If any of the following side effects continue, are bothersome or if you have any questions about them, check with your health care professional:

For Healthcare Professionals

Applies to botulinum toxin type b: injectable solution

Cardiovascular

Cardiovascular side effects have included headache (up to 16%) and chest pain.

Dermatologic

Dermatologic side effects including pruritus have been reported in 2% of patients or less.

Gastrointestinal

Gastrointestinal side effects have included dysphagia (up to 25%), dyspepsia (up to 10%), nausea (up to 10%), and to a lesser extent (2% or less) vomiting, glossitis, stomatitis, and tooth disorder.

General

Dry mouth is the most commonly reported adverse effect (occurring in up to 34% of patients). Other general side effects have included torticollis (up to 8%) and, to a lesser extent (2% or less), fever, chills, hernia, malaise, abscess, cyst, and neoplasm.

Genitourinary

Genitourinary side effects reported in 2% of patients or less have included urinary tract infection, cystitis, and vaginal moniliasis.

Immunologic

Immunologic side effects have included infection (up to 19%) and flu syndrome (up to 9%). Other immunologic side effects reported to a lesser extent (2% or less) have included otitis media and viral infection.

Local

Local side effects including injection site pain have been reported (up to 16%).

Musculoskeletal

Musculoskeletal side effects have included neck pain related to cervical dystonia (up to 17%), torticollis (up to 8%), arthralgia (up to 7%), back pain (up to 7%), myasthenia (up to 6%), and asthenia (up to 6%). Other musculoskeletal side effects reported in 2% of patients or less have included arthritis and joint disorder.

Nervous system

Nervous system side effects reported in 2% of patients or less have included anxiety, tremor, hyperesthesia, somnolence, confusion, pain related to cervical dystonia/torticollis, vertigo, and vasodilation.

Respiratory

Respiratory side effects have included increased cough (up to 7%), rhinitis (up to 6%), and, to a lesser extent (2% or less), dyspnea, lung disorder, and pneumonia.

Ocular

Ocular side effects including a case of bilateral ptosis have been reported.

Disclaimer: Every effort has been made to ensure that the information provided is accurate, up-to-date and complete, but no guarantee is made to that effect. In addition, the drug information contained herein may be time sensitive and should not be utilized as a reference resource beyond the date hereof. This material does not endorse drugs, diagnose patients, or recommend therapy. This information is a reference resource designed as supplement to, and not a substitute for, the expertise, skill , knowledge, and judgement of healthcare practitioners in patient care. The absence of a warning for a given drug or combination thereof in no way should be construed to indicate safety, effectiveness, or appropriateness for any given patient. Drugs.com does not assume any responsibility for any aspect of healthcare administered with the aid of materials provided. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the substances you are taking, check with your doctor, nurse, or pharmacist.

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